/Engine/Source/Editor/UnrealEd/Public/EditorLevelUtils.h
Moves the specified list of actors to the specified streaming level. The new actors will be selected
The number of actors that were successfully moved to the new level
static int32 MoveActorsToLevel ( const [TArray](API\Runtime\Core\Containers\TArray)< [AActor](API\Runtime\Engine\GameFramework\AActor) * > & ActorsToMove, [ULevelStreaming](API\Runtime\Engine\Engine\ULevelStreaming) * DestStreamingLevel, bool bWarnAboutReferences, bool bWarnAboutRenaming )